X0303 4 2009-05-08 0 0001168195 SOURCEFIRE INC FIRE 0001392138 Chandna Asheem C/O SOURCEFIRE, INC. 9770 PATUXENT WOODS DRIVE COLUMBIA MD 21046 1 0 0 0 Common Stock 2009-05-08 4 S 0 25000 11.52 D 181376 I Held by revocable trust Common Stock 2009-05-11 4 S 0 25000 11.083 D 156376 I Held by revocable trust Common Stock 2009-05-12 4 S 0 25000 10.392 D 131376 I Held by revocable trust Common Stock 11444 D Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $11.43 to $11.65 per share. The reporting person undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Includes 8,209 shares previously held directly which have been transferred to the Chandra Family Revocable Trust. These shares are held by Asheem Chandna and Aarti Chandna, as Trustees of the Chandna Family Revocable Trust of April 13, 1998. Aarti Chandna has voting and investment control with respect to the shares held by the trust. Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $11.00 to $11.26 per share. The reporting person undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $10.29 to $10.60 per share. The reporting person undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. /s/ Brian F. Leaf, attorney-in-fact 2009-05-12